Even the smallest plecos need 30+ gallons. I have a bristlenose in my 29g and he's almost 6in! A nice bottom feeder alternative would be some snails like nerite or mystery snails or some shrimp (cherry shrimp, amano shrimp, ghost shrimp). But this all depends on your tank mates

Yes. Check out PlanetCatfish and even Monsterfishkeepers and do your own research. This isn't the place to get your answer. Most here think a BN is just one species.

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May I ask what Pleco you would put in a 14g aquarium?

There are four main species of ancistrus bristlenose plecos, found in the trade which are Ancistus sp. , Ancistus sp.(L144) , Ancistrus cirrhosus ,Ancistrus cf. cirrhosus, and they all get to big to be in a 14g , 20g at the bare minimum would be needed but a 29g better.

Yes. Check out PlanetCatfish and even Monsterfishkeepers and do your own research. This isn't the place to get your answer. Most here think a BN is just one species.

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I doubt that is true. I know of hundreds of species of plecos, lots of BN plecos as well. I have had albino BN and currently have two Lemon BN plecos. I still wouldn't suggest keeping a pleco in a 14 gallon. Plecos are long...even the 4in varieties...and they wouldn't be happy in a tank with that footprint since they wouldn't have proper swimming and exploring space.

There are four main species of ancistrus bristlenose plecos, found in the trade which are Ancistus sp. , Ancistus sp.(L144) , Ancistrus cirrhosus ,Ancistrus cf. cirrhosus, and they all get to big to be in a 14g , 20g at the bare minimum would be needed but a 29g better.

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I wasn't looking at the BNs specifically, but personally, I wouldn't hesitate putting an inambari dwarf bn in a 10g, if only I could find where to buy them. There is also the ancistrus claro. The pitbull pleco or parotocinclus is another option. There are some small panaques or woodeating plecos I would add as well, but only one. I'm not an expert at all, but some of these comments And of course, people will disagree with me. I don't think the OP knows what kind he wants. I figgure this isn't the best place to find out.